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Journal of Composite Materials
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0021998308092210v1
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Numerical Modeling of Gas Leakage Through Damaged Composite Laminates

Hisashi Kumazawa

Structure Technology Center, Japan Aerospace Exploration Agency 6-13-1 Ohsawa, Mitaka-shi, Tokyo 181-0015, Japan, kumazawa.hisashi{at}jaxa.jp

John Whitcomb

Department of Aerospace Engineering, Texas A&M University 3141 TAMU, College Station, TX 77843-3141, USA

A computational fluid dynamics (CFD) model was developed to predict leakage through a damaged laminate. Crack opening displacements (COD) from a 3D finite element model were fit using a polynomial function. This curve fit was then used in defining the openings in the CFD model. Delamination length at crack intersections was estimated based on experimental data for specimens subjected to thermal loads only. Leakage under combined thermal and biaxial mechanical loadings was predicted with the estimated delamination length. Considering the sensitivity of the predictions to many variables, the calculated leakage under combined thermal and biaxial mechanical loadings was estimated with reasonable accuracy.

Key Words: laminates • leakage • finite element analysis • cracks • delamination • cryogenic tank.

This version was published on August 1, 2008

Journal of Composite Materials, Vol. 42, No. 16, 1619-1638 (2008)
DOI: 10.1177/0021998308092210
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